To create a model, you can start with a variety of 3D geometric primitives.
You can also use 2D shapes as the basis for lofted or extruded objects. You can convert objects to a variety of editable surface types, which you can then model further by pulling vertices and using other tools.
Another modeling tool is to apply modifiers to objects. Modifiers can change object geometry. Bend and Twist are examples of modifiers.
Modeling, editing, and animation tools are available in the command panels and toolbar.